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Question (21)

QN0018262

1 + 3 + 5 + 7 is equal to:

(A) 14
(B) 15
(C) 16
(D) 17

Correct Answer: C

Explanation:

1 + 3 + 5 + 7 = 16 = 4².

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Question (22)

QN0018263

The sum of the first 6 odd numbers is:

(A) 30
(B) 35
(C) 36
(D) 49

Correct Answer: C

Explanation:

Sum of first n odd numbers = n². Thus, 6² = 36.

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Question (23)

QN0018264

Which perfect square is obtained by adding the first 8 odd numbers?

(A) 49
(B) 64
(C) 81
(D) 100

Correct Answer: B

Explanation:

Sum of first 8 odd numbers = 8² = 64.

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Question (24)

QN0018265

If 35² = 1225, then 36² equals:

(A) 1260
(B) 1290
(C) 1296
(D) 1300

Correct Answer: C

Explanation:

36² = 35² + 71 = 1225 + 71 = 1296.

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Question (25)

QN0018266

The 40th odd number is:

(A) 79
(B) 80
(C) 81
(D) 83

Correct Answer: A

Explanation:

nth odd number = 2n − 1 = 2×40 − 1 = 79.

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Question (26)

QN0018267

Which number is a perfect square?

(A) 38
(B) 47
(C) 64
(D) 83

Correct Answer: C

Explanation:

64 = 8².

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Question (27)

QN0018268

How many numbers lie between 10² and 11²?

(A) 19
(B) 20
(C) 21
(D) 22

Correct Answer: B

Explanation:

11² − 10² − 1 = 121 − 100 − 1 = 20.

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Question (28)

QN0018269

How many numbers lie between 20² and 21²?

(A) 39
(B) 40
(C) 41
(D) 42

Correct Answer: B

Explanation:

21² − 20² − 1 = 441 − 400 − 1 = 40.

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Question (29)

QN0018270

Which triangular-number relation is correct?

(A) 1 + 3 = 5
(B) 3 + 6 = 9
(C) 6 + 10 = 15
(D) 10 + 15 = 20

Correct Answer: B

Explanation:

3 + 6 = 9 = 3².

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Question (30)

QN0018271

The square root of 49 is:

(A) 5
(B) 6
(C) 7
(D) 8

Correct Answer: C

Explanation:

7 × 7 = 49.

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